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谁知道在查阅资料时还有一些额外的收获😄 。</p><p>于是，今天不谈富文本编辑器，而是一起学一下跟它相关的几个神奇的属性。
或许好多同学跟我一样，还从没见过，它们分别是：<strong>isContentEditable</strong>、<strong>designMode</strong>、<strong>user-modify</strong>
和几乎人人都知道的<strong>contenteditable</strong>。</p><h2 id="iscontenteditable"><a href="#iscontenteditable" aria-hidden="true" class="header-anchor">#</a> isContentEditable</h2><p>很简单，一个只读的属性，返回true或false，表示页面元素是否可编辑。</p><h2 id="designmode"><a href="#designmode" aria-hidden="true" class="header-anchor">#</a> designMode</h2><p>是document的一个全局开关，可读可写，有两个值：“on”、“off”，表示<strong>整个页面</strong>是否可编辑。一般情况下，document.designMode返回是off。
可以手动设置’开‘或者’关‘，不妨自己试一下，在console里输入:</p><pre class="language-js"><code>document<span class="token punctuation">.</span>designMode <span class="token operator">=</span> <span class="token string">'on'</span>
</code></pre><p>再用鼠标点一点页面，是不是发现了神奇的现象？！</p><p>参考下图：
<img src="http://pn4meizzc.bkt.clouddn.com/blogeditable.gif" alt="示意图">
整个页面都变成了可编辑状态。
这时候，所有元素的isContentEditable属性都变成了true：</p><pre class="language-js"><code>document<span class="token punctuation">.</span>documentElement<span class="token punctuation">.</span>isContentEditable   <span class="token comment">//true</span>
document<span class="token punctuation">.</span>body<span class="token punctuation">.</span>isContentEditable   <span class="token comment">//true</span>
document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'#id'</span><span class="token punctuation">)</span><span class="token punctuation">.</span>isContentEditable   <span class="token comment">//true</span>
</code></pre><h2 id="user-modify"><a href="#user-modify" aria-hidden="true" class="header-anchor">#</a> user-modify</h2><p>这家伙是一个CSS属性！但其功能不可小觑，可以称得上是CSS版的contenteditable。</p><pre class="language-css"><code><span class="token property">user-modify</span><span class="token punctuation">:</span> read-only<span class="token punctuation">;</span>   //只读
<span class="token property">user-modify</span><span class="token punctuation">:</span> read-write<span class="token punctuation">;</span>  //读写，支持富文本
<span class="token property">user-modify</span><span class="token punctuation">:</span> write-only<span class="token punctuation">;</span>  //只写？！ 什么鬼，不知道啥意思
<span class="token property">user-modify</span><span class="token punctuation">:</span> read-write-plaintext-only<span class="token punctuation">;</span>  //读写，但只可输入文本
</code></pre><p>直接看张鑫旭大大的<a href="http://www.zhangxinxu.com/study/201601/user-modify.html" target="_blank" rel="noopener noreferrer">Demo</a>吧。</p><div class="warning custom-block"><p class="custom-block-title">注意</p><p>但这时候，isContentEditable是检测不到的该元素是否可编辑的</p></div><h2 id="contenteditable"><a href="#contenteditable" aria-hidden="true" class="header-anchor">#</a> contenteditable</h2><p>前两个属性都存在很大的缺点，designMode是针对整个document的，对于想做到模块化的编辑器的实现是很难得，
user-modify的兼容性更是经不起太多的考验。</p><p>那么就只剩下contenteditable了，这是大多数浏览器都能兼容的。</p><pre class="language-js"><code>contenteditable<span class="token operator">=</span><span class="token string">&quot;&quot;</span>  <span class="token comment">//与contenteditable=&quot;true&quot;效果一样</span>
contenteditable<span class="token operator">=</span><span class="token string">&quot;events&quot;</span>
contenteditable<span class="token operator">=</span><span class="token string">&quot;caret&quot;</span>
contenteditable<span class="token operator">=</span><span class="token string">&quot;typing&quot;</span>
contenteditable<span class="token operator">=</span><span class="token string">&quot;plaintext-only&quot;</span>  <span class="token comment">//可编辑，只允许纯文本</span>
contenteditable<span class="token operator">=</span><span class="token string">&quot;true&quot;</span>			<span class="token comment">//可编辑，支持富文本</span>
contenteditable<span class="token operator">=</span><span class="token string">&quot;false&quot;</span>     <span class="token comment">//不可编辑</span>
</code></pre><p>&quot;events&quot;、&quot;caret&quot;、&quot;typing&quot;看了半天<a href="https://w3c.github.io/editing/contentEditable.html#contenteditable" target="_blank" rel="noopener noreferrer">文档</a>也没搞清楚啥意思，而且貌似现在的浏览器也不支持。
可以自己试下：点<a href="http://www.w3school.com.cn/tiy/t.asp?f=html5_global_contenteditable" target="_blank" rel="noopener noreferrer">这里</a>。有知道的大神还望指导一下下🙏 ~</p><h2 id="demo"><a href="#demo" aria-hidden="true" class="header-anchor">#</a> demo:</h2><div class="editable-wrapper"><div class="options"><form class="el-form"><div class="el-form-item"><label class="el-form-item__label">contenteditable:</label><div class="el-form-item__content"><div class="el-select el-select--small"><!----><div class="el-input el-input--small el-input--suffix"><!----><input type="text" autocomplete="off" placeholder="请选择" readonly="readonly" value="" class="el-input__inner"><!----><span class="el-input__suffix"><span class="el-input__suffix-inner"><i class="el-select__caret el-input__icon el-icon-arrow-up"></i><!----></span><!----></span><!----></div><div class="el-select-dropdown el-popper" style="min-width:;display:none;"><div class="el-scrollbar" style="display:none;"><div class="el-select-dropdown__wrap el-scrollbar__wrap el-scrollbar__wrap--hidden-default"><ul class="el-scrollbar__view el-select-dropdown__list"><!----><li class="el-select-dropdown__item selected"><span>空</span></li><li class="el-select-dropdown__item"><span>events</span></li><li class="el-select-dropdown__item"><span>caret</span></li><li class="el-select-dropdown__item"><span>typing</span></li><li class="el-select-dropdown__item"><span>plaintext-only</span></li><li class="el-select-dropdown__item"><span>true</span></li><li class="el-select-dropdown__item"><span>false</span></li></ul></div><div class="el-scrollbar__bar is-horizontal"><div class="el-scrollbar__thumb" style="width:0;transform:translateX(0%);ms-transform:translateX(0%);webkit-transform:translateX(0%);"></div></div><div class="el-scrollbar__bar is-vertical"><div class="el-scrollbar__thumb" style="height:0;transform:translateY(0%);ms-transform:translateY(0%);webkit-transform:translateY(0%);"></div></div></div><p class="el-select-dropdown__empty">
        无数据
      </p></div></div><!----></div></div></form></div><div class="textarea"></div></div><h2 id="总结"><a href="#总结" aria-hidden="true" class="header-anchor">#</a> 总结</h2><p>只是蜻蜓点水般的介绍，具体细节没有深究。后续的文章会就与contenteditable有关的几个对象展开学习。</p><h2 id="参考资料"><a href="#参考资料" aria-hidden="true" class="header-anchor">#</a> 参考资料</h2><ul><li><a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/isContentEditable" target="_blank" rel="noopener noreferrer">HTMLElement.isContentEditable</a></li><li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/designMode" target="_blank" rel="noopener noreferrer">Document.designMode</a></li><li><a href="https://w3c.github.io/editing/contentEditable.html#contenteditable" target="_blank" rel="noopener noreferrer">ContentEditable</a></li><li><a href="http://www.zhangxinxu.com/wordpress/2016/01/contenteditable-plaintext-only/" target="_blank" rel="noopener noreferrer">小tip: 如何让contenteditable元素只能输入纯文本</a></li></ul></div><div class="wx-wrapper" data-v-0de8a4bf><p class="wx-txt" data-v-0de8a4bf>欢迎关注</p><img src="http://pn4meizzc.bkt.clouddn.com/wxqr.png" class="wx-img" data-v-0de8a4bf></div><div class="beg-wrapper" data-v-1f1af99c><a href="javascript:;" class="btn show" data-v-1f1af99c><img src="http://pn4meizzc.bkt.clouddn.com/blogshang_log.png" data-v-1f1af99c></a><p class="shang-txt" data-v-1f1af99c>赏不赏，看您心情</p><img src="http://pn4meizzc.bkt.clouddn.com/blogWechatIMG35.jpeg" class="shangImg" data-v-1f1af99c></div><!----><div class="content page-nav"><p class="inner"><span class="prev">
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